A travelling wave is partly reflected and partly transmitted from a rigid boundary. Let \( a_{i}...

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A travelling wave is partly reflected and partly transmitted from a rigid boundary. Let \( a_{i}, a_{r} \) and
\( P \) \( \mathrm{a}_{\mathrm{t}} \) be the amplitude of incident wave, reflected W wave and transmitted wave and \( \mathrm{I}_{\mathrm{i}}, \mathrm{I}_{\mathrm{r}} \) and \( \mathrm{I}_{\mathrm{t}} \) be the corresponding intensities. Then choose the correct alternatives :
(1) \( \frac{I_{i}}{I_{r}}=\left(\frac{a_{i}}{a_{r}}\right)^{2} \) :
(2) \( \frac{I_{i}}{I_{t}}=\left(\frac{a_{i}}{a_{t}}\right)^{2} \)
(3) \( \frac{I_{r}}{I_{t}}=\left(\frac{a_{r}}{a_{t}}\right)^{2} \)
(4) All of these
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